Hurricane CELIA (Text)

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HURRICANE CELIA DISCUSSION NUMBER 20
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL EP042010
800 PM PDT WED JUN 23 2010
THE DEVELOPMENTAL TREND THAT CELIA WAS EXPERIENCING EARLIER HAS BEEN
DISRUPTED. THE EYE OF THE HURRICANE HAS DISAPPEARED AND THE
CONVECTIVE STRUCTURE HAS BECOME ASYMMETRIC. AN 2129 UTC AMSU-B
OVERPASS DEPICTED A CLOSED EYE BUT THE INNER CORE ORGANIZATION OF
THE HURRICANE HAS DETERIORATED FURTHER SINCE THEN. IN ADDITION...A
WELL-DEFINED BANDING FEATURE NOTED SEVERAL HOURS AGO HAS SHRUNK
CONSIDERABLY. DVORAK INTENSITY ESTIMATES HAVE DECREASED TO 4.5 AND
5.0 FROM SAB AND TAFB...RESPECTIVELY. BASED UPON THE THESE AND THE
DEGRADED SATELLITE APPEARANCE...THE INITIAL INTENSITY OF CELIA IS
LOWERED TO 90 KT.
RECENT CENTER FIXES...THOUGH SOMEWHAT UNCERTAIN...YIELD THE SAME
INITIAL MOTION ESTIMATE FROM THE PREVIOUS ADVISORY...280/11. LARGE-
SCALE MODELS SHOW CELIA MAINTAINING A WESTERLY MOTION DURING THE
NEXT 24 HOURS UNDER THE INFLUENCE OF MID-LEVEL RIDGING TO THE
NORTH. THEREAFTER...AN AMPLIFYING MID/UPPER-LEVEL TROUGH MOVING
INTO THE WESTERN UNITED STATES IS EXPECTED TO WEAKEN THE RIDGE
ENOUGH TO IMPART CELIA WITH A WEST-NORTHWESTWARD MOTION THROUGH AT
LEAST 72 HOURS. BEYOND 72 HOURS..MODEL GUIDANCE INDICATES THAT
MID-LEVEL RIDGING SHOULD RE-ESTABLISH ITSELF NORTH OF THE
CYCLONE...TAKING IT BACK ON A WESTERLY COURSE AT A SLOWER FORWARD
SPEED. THE OFFICIAL FORECAST TRACK REPRESENTS A BLEND OF THE
PREVIOUS OFFICIAL FORECAST AND THE MULTI-MODEL CONSENSUS.
THE RECENT INTENSITY TRENDS ARE PUZZLING...AND IT IS NOT CLEAR WHAT
HAS LED TO THE CURRENT DISORGANIZED STATE. SHIPS MODEL GUIDANCE
INDICATES THAT CELIA REMAINS IN A VERY LIGHT SHEAR ENVIRONMENT OVER
HIGH SEA SURFACE TEMPERATURES WHICH SHOULD FAVOR MAINTENANCE OF ITS
CURRENT INTENSITY OR PERHAPS SOME ADDITIONAL STRENGTHENING IN THE
SHORT-TERM. CELIA SHOULD REACH PROGRESSIVELY COOLER WATERS BEYOND 48
HOURS AND BEGIN A WEAKENING TREND WHICH SHOULD BECOME FASTER TOWARD
THE END OF THE PERIOD. THE NEW INTENSITY FORECAST IS ADJUSTED
DOWNWARD...CLOSELY FOLLOWING THE SHIPS/LGEM INTENSITY GUIDANCE
WHICH NO LONGER STRENGTHEN THE HURRICANE AS MUCH.
FORECAST POSITIONS AND MAX WINDS
INITIAL 24/0300Z 12.4N 111.5W 90 KT
12HR VT 24/1200Z 12.8N 113.4W 100 KT
24HR VT 25/0000Z 13.5N 115.8W 105 KT
36HR VT 25/1200Z 14.1N 118.1W 100 KT
48HR VT 26/0000Z 14.8N 120.1W 90 KT
72HR VT 27/0000Z 15.9N 123.5W 65 KT
96HR VT 28/0000Z 16.2N 125.5W 55 KT
120HR VT 29/0000Z 16.5N 126.5W 40 KT
$$
FORECASTER KIMBERLAIN
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